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Add CWT, COSE, SenML, and WebAuthn examples
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@fxamacker
fxamacker committed Nov 20, 2019
1 parent 47272c9 commit 61d7682
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143 changes: 143 additions & 0 deletions example_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -294,3 +294,146 @@ func ExampleEncoder_indefiniteLengthMap() {
// Output:
// bf61610161629f0203ffff
}

func Example_cWT() {
// Use "keyasint" struct tag to encode/decode struct from/to CBOR map.
type claims struct {
Iss string `cbor:"1,keyasint"`
Sub string `cbor:"2,keyasint"`
Aud string `cbor:"3,keyasint"`
Exp int `cbor:"4,keyasint"`
Nbf int `cbor:"5,keyasint"`
Iat int `cbor:"6,keyasint"`
Cti []byte `cbor:"7,keyasint"`
}
// Data from https://tools.ietf.org/html/rfc8392#appendix-A section A.1
cborData := hexDecode("a70175636f61703a2f2f61732e6578616d706c652e636f6d02656572696b77037818636f61703a2f2f6c696768742e6578616d706c652e636f6d041a5612aeb0051a5610d9f0061a5610d9f007420b71")
var v claims
if err := cbor.Unmarshal(cborData, &v); err != nil {
fmt.Println("error:", err)
}
if _, err := cbor.Marshal(v, cbor.EncOptions{}); err != nil {
fmt.Println("error:", err)
}
fmt.Printf("%+v", v)
// Output:
// {Iss:coap://as.example.com Sub:erikw Aud:coap://light.example.com Exp:1444064944 Nbf:1443944944 Iat:1443944944 Cti:[11 113]}
}

func Example_signedCWT() {
// Use "keyasint" struct tag to encode/decode struct from/to CBOR map.
// Partial COSE header definition
type coseHeader struct {
Alg int `cbor:"1,keyasint,omitempty"`
Kid []byte `cbor:"4,keyasint,omitempty"`
IV []byte `cbor:"5,keyasint,omitempty"`
}
// Use "toarray" struct tag to encode/decode struct from/to CBOR array.
type signedCWT struct {
_ struct{} `cbor:",toarray"`
Protected []byte
Unprotected coseHeader
Payload []byte
Signature []byte
}
// Data from https://tools.ietf.org/html/rfc8392#appendix-A section A.3
cborData := hexDecode("d28443a10126a104524173796d6d657472696345434453413235365850a70175636f61703a2f2f61732e6578616d706c652e636f6d02656572696b77037818636f61703a2f2f6c696768742e6578616d706c652e636f6d041a5612aeb0051a5610d9f0061a5610d9f007420b7158405427c1ff28d23fbad1f29c4c7c6a555e601d6fa29f9179bc3d7438bacaca5acd08c8d4d4f96131680c429a01f85951ecee743a52b9b63632c57209120e1c9e30")
var v signedCWT
if err := cbor.Unmarshal(cborData, &v); err != nil {
fmt.Println("error:", err)
}
if _, err := cbor.Marshal(v, cbor.EncOptions{}); err != nil {
fmt.Println("error:", err)
}
fmt.Printf("%+v", v)
// Output:
// {_:{} Protected:[161 1 38] Unprotected:{Alg:0 Kid:[65 115 121 109 109 101 116 114 105 99 69 67 68 83 65 50 53 54] IV:[]} Payload:[167 1 117 99 111 97 112 58 47 47 97 115 46 101 120 97 109 112 108 101 46 99 111 109 2 101 101 114 105 107 119 3 120 24 99 111 97 112 58 47 47 108 105 103 104 116 46 101 120 97 109 112 108 101 46 99 111 109 4 26 86 18 174 176 5 26 86 16 217 240 6 26 86 16 217 240 7 66 11 113] Signature:[84 39 193 255 40 210 63 186 209 242 156 76 124 106 85 94 96 29 111 162 159 145 121 188 61 116 56 186 202 202 90 205 8 200 212 212 249 97 49 104 12 66 154 1 248 89 81 236 238 116 58 82 185 182 54 50 197 114 9 18 14 28 158 48]}
}

func Example_cOSE() {
// Use "keyasint" struct tag to encode/decode struct from/to CBOR map.
// Use cbor.RawMessage to delay unmarshaling (CrvOrNOrK's data type depends on Kty's value).
type coseKey struct {
Kty int `cbor:"1,keyasint,omitempty"`
Kid []byte `cbor:"2,keyasint,omitempty"`
Alg int `cbor:"3,keyasint,omitempty"`
KeyOpts int `cbor:"4,keyasint,omitempty"`
IV []byte `cbor:"5,keyasint,omitempty"`
CrvOrNOrK cbor.RawMessage `cbor:"-1,keyasint,omitempty"` // K for symmetric keys, Crv for elliptic curve keys, N for RSA modulus
XOrE cbor.RawMessage `cbor:"-2,keyasint,omitempty"` // X for curve x-coordinate, E for RSA public exponent
Y cbor.RawMessage `cbor:"-3,keyasint,omitempty"` // Y for curve y-cooridate
D []byte `cbor:"-4,keyasint,omitempty"`
}
// Data from https://tools.ietf.org/html/rfc8392#appendix-A section A.2
// 128-Bit Symmetric Key
cborData := hexDecode("a42050231f4c4d4d3051fdc2ec0a3851d5b3830104024c53796d6d6574726963313238030a")
var v coseKey
if err := cbor.Unmarshal(cborData, &v); err != nil {
fmt.Println("error:", err)
}
if _, err := cbor.Marshal(v, cbor.EncOptions{}); err != nil {
fmt.Println("error:", err)
}
fmt.Printf("%+v", v)
// Output:
// {Kty:4 Kid:[83 121 109 109 101 116 114 105 99 49 50 56] Alg:10 KeyOpts:0 IV:[] CrvOrNOrK:[80 35 31 76 77 77 48 81 253 194 236 10 56 81 213 179 131] XOrE:[] Y:[] D:[]}
}

func Example_senML() {
// Use "keyasint" struct tag to encode/decode struct from/to CBOR map.
type SenMLRecord struct {
BaseName string `cbor:"-2,keyasint,omitempty"`
BaseTime float64 `cbor:"-3,keyasint,omitempty"`
BaseUnit string `cbor:"-4,keyasint,omitempty"`
BaseValue float64 `cbor:"-5,keyasint,omitempty"`
BaseSum float64 `cbor:"-6,keyasint,omitempty"`
BaseVersion int `cbor:"-1,keyasint,omitempty"`
Name string `cbor:"0,keyasint,omitempty"`
Unit string `cbor:"1,keyasint,omitempty"`
Time int `cbor:"6,keyasint,omitempty"`
UpdateTime float64 `cbor:"7,keyasint,omitempty"`
Value float64 `cbor:"2,keyasint,omitempty"`
ValueS string `cbor:"3,keyasint,omitempty"`
ValueB bool `cbor:"4,keyasint,omitempty"`
ValueD []byte `cbor:"8,keyasint,omitempty"`
Sum float64 `cbor:"5,keyasint,omitempty"`
}
// Data from https://tools.ietf.org/html/rfc8428#section-6
cborData := hexDecode("87a721781b75726e3a6465763a6f773a3130653230373361303130383030363a22fb41d303a15b00106223614120050067766f6c7461676501615602fb405e066666666666a3006763757272656e74062402fb3ff3333333333333a3006763757272656e74062302fb3ff4cccccccccccda3006763757272656e74062202fb3ff6666666666666a3006763757272656e74062102f93e00a3006763757272656e74062002fb3ff999999999999aa3006763757272656e74060002fb3ffb333333333333")
var v []SenMLRecord
if err := cbor.Unmarshal(cborData, &v); err != nil {
fmt.Println("error:", err)
}
if _, err := cbor.Marshal(v, cbor.EncOptions{}); err != nil {
fmt.Println("error:", err)
}
for _, rec := range v {
fmt.Printf("%+v\n", rec)
}
// Output:
// {BaseName:urn:dev:ow:10e2073a0108006: BaseTime:1.276020076001e+09 BaseUnit:A BaseValue:0 BaseSum:0 BaseVersion:5 Name:voltage Unit:V Time:0 UpdateTime:0 Value:120.1 ValueS: ValueB:false ValueD:[] Sum:0}
// {BaseName: BaseTime:0 BaseUnit: BaseValue:0 BaseSum:0 BaseVersion:0 Name:current Unit: Time:-5 UpdateTime:0 Value:1.2 ValueS: ValueB:false ValueD:[] Sum:0}
// {BaseName: BaseTime:0 BaseUnit: BaseValue:0 BaseSum:0 BaseVersion:0 Name:current Unit: Time:-4 UpdateTime:0 Value:1.3 ValueS: ValueB:false ValueD:[] Sum:0}
// {BaseName: BaseTime:0 BaseUnit: BaseValue:0 BaseSum:0 BaseVersion:0 Name:current Unit: Time:-3 UpdateTime:0 Value:1.4 ValueS: ValueB:false ValueD:[] Sum:0}
// {BaseName: BaseTime:0 BaseUnit: BaseValue:0 BaseSum:0 BaseVersion:0 Name:current Unit: Time:-2 UpdateTime:0 Value:1.5 ValueS: ValueB:false ValueD:[] Sum:0}
// {BaseName: BaseTime:0 BaseUnit: BaseValue:0 BaseSum:0 BaseVersion:0 Name:current Unit: Time:-1 UpdateTime:0 Value:1.6 ValueS: ValueB:false ValueD:[] Sum:0}
// {BaseName: BaseTime:0 BaseUnit: BaseValue:0 BaseSum:0 BaseVersion:0 Name:current Unit: Time:0 UpdateTime:0 Value:1.7 ValueS: ValueB:false ValueD:[] Sum:0}
}

func Example_webAuthn() {
// Use cbor.RawMessage to delay unmarshaling (AttStmt's data type depends on Fmt's value).
type attestationObject struct {
AuthnData []byte `cbor:"authData"`
Fmt string `cbor:"fmt"`
AttStmt cbor.RawMessage `cbor:"attStmt"`
}
cborData := hexDecode("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")
var v attestationObject
if err := cbor.Unmarshal(cborData, &v); err != nil {
fmt.Println("error:", err)
}
if _, err := cbor.Marshal(v, cbor.EncOptions{}); err != nil {
fmt.Println("error:", err)
}
fmt.Printf("%+v", v)
}

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